1880.] 385 (Patton, 
female ciliated externally with long bristles. Petiole no longer than 
the posterior coxae; abdomen convex, the tip pointed in the female. 
Both Dahlbom and Smith have described the tarsal claws of 
Priononyz as quadridentate, doubtless overlooking the small basal 
tooth which is difficult to see unless the claw is detached. This fifth 
tooth is present in both thomae and atrata. 
Tn the ° of thomae the notch in the clypeus is shallow, and above 
it is a rounded depression. Small specimens of atrata approach 
thomae in these respects. In the ¢ of thomae the 6th and 7th ven- 
tral segments have a deep median sinus on the margin. In atrata the 
margin of these segments is entire. 
List oF THE NortH AMERICAN LARRADAE. 
By W. H. Patron. 
SYNOPSIS OF THE GENERA. 
I. Eyes reniform; second submarginal cell petiolate . . PIson 
II. Eyes entire; second submarginal cell not petiolate. 
A. Exterior margin of the mandibles scarcely emarginate. 
a. First submarginal cell shorter than the two follow- 
ing taken together, divided by a spurious ner- 
vure. Eyes of the ¢ meeting on the vertex. 
Two spurs on the intermediate tibiae. ASTATA 
6. First submarginal cell longer than the two followin. 
together, not divided. Eyes not meeting on the 
vertex. Mandibles not dentate within. Lrris 
B. Exterior margin of the mandibles with a broad and deep 
emargination near the base. 
a. ‘Three distinct ocelli. . - . . Lyropa 
b. Posterior ocelli distorted or obsolete. 
1. Metathorax as long asthe mesothorax, trun- 
cated behind; marginal cell truncate. 
LARRA 
2. Metathorax shorter than the mesothorax, 
rounded behind; marginal cell narrow and 
rounded at the apex. Mandibles dentate 
within . . . : . TAacHyYTEs 
PROCEEDINGS B. S. N. H.— VOL. XX. 25 OCTOBER, 1880. 
